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Hands-on activity

Medium ~120 min

Build a raised garden bed

A sturdy classroom-friendly bed where kids can grow vegetables, herbs, and observe soil up close.

#build #school-yard #primary #secondary

Raised beds are the single fastest way to bring living soil into a school yard. They sidestep poor or contaminated ground, are easy on backs, and let learners observe roots, compost and biodiversity right at hand-level.

You'll need: untreated planks (cedar or pine), screws, a drill, landscape fabric, compost, topsoil, and one weekend morning with a small crew. Aim for a bed that is 1.2 m × 2.4 m and 30 cm tall — narrow enough that no one ever needs to step on the soil.

Steps

  1. 1

    Pick the spot

    Choose a sunny location (6+ hours of direct sun), level enough that water won't pool. Avoid the shadow of buildings and the spread of large trees. Mark out the footprint with stakes and string.

  2. 2

    Cut the timbers

    Cut your planks into two long pieces (2.4 m) and two shorter ones (1.2 m). Use untreated timber — pressure-treated wood can leach into the soil. Cedar lasts longest; pine is cheaper and fine for 3–4 years.

  3. 3

    Assemble the frame

    Pre-drill the corners and screw the frame together on flat ground. Two screws per corner. Have one child hold the boards while another drives the screws — a great moment to talk about teamwork.

  4. 4

    Place and line it

    Move the frame into position, level it with a spirit level, and shim with stones if needed. Lay landscape fabric on the inside bottom to slow weeds without trapping water.

  5. 5

    Fill with the soil sandwich

    Layer from bottom up: 5 cm of small branches and twigs (helps drainage and slow release of nutrients), then 10 cm of leaf mould or straw, then a generous 15 cm of compost mixed with topsoil on top.

  6. 6

    Water it in and plant

    Soak the bed thoroughly — the layers settle as you water. Wait a day, then plant. Start with quick-growing crops kids will recognise: radishes, lettuce, beans, marigolds. Add a simple sign with the planting date.

  7. 7

    Set up a care rota

    Two children per week, ten minutes per day. They water, weed, and write one observation in the class notebook. Over a term, those notebooks become the richest soil-literacy resource your school has.

Wrap-up

Once it's built: resist the urge to dig the soil. The whole point of the raised bed is that nobody compacts it again. Add 2 cm of fresh compost every spring on top, let the worms do the mixing.

The first season, expect things to settle by 5–10 cm — top it up. Save tomato cages and a roll of horticultural fleece for cold snaps and you'll get an extra month of growing on each end of the year.

📺 Videos

Three-minute raised-bed build

Placeholder — replace with the real walkthrough recorded with your school crew.

🔗 Additional resources

Linked MOOC lessons

This activity is referenced from these lessons. Open one to bring the activity back into the learning flow.